2.11
Summary

In this chapter, we've met Python's built-in object
types梟umbers, strings, lists, dictionaries, tuples, and
files梐long with the operations Python provides for processing
them. We've also noticed some of the themes underlying objects
in Python along the way; in particular, the notions of operation
overloading and type categories help to simplify types in Python.
Finally, we've seen a few common pitfalls of built-in types.

Almost all the examples in this chapter were deliberately artificial
to illustrate the basics. In the next chapter, we'll start
studying statements that create and process objects and let us build
up programs that do more realistic work.

Other Types in Python

Besides the core objects we've studied in this chapter, a
typical Python installation has dozens of other object types
available as linked-in C extensions or Python classes. We'll
see examples of a few later in the book梤egular expression
objects, DBM files, GUI widgets, and so on. The main difference
between these extra tools and the built-in types we've just
seen is that the built-ins provide special language
creation syntax for their objects (e.g.,
4 for an integer, [1,2] for a
list, the open function for files). Other tools
are generally exported in a built-in module that you must first
import to use. See Python's library reference for a
comprehensive guide to all the tools available to Python programs.